ConfigurationManager 讀寫AppSettings索引值對

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using System;using System.Configuration;namespace ConsoleApplication1{    class Program    {        static void Main(string[] args)        {            ReadAllSettings();            ReadSetting("Setting1");            ReadSetting("NotValid");            AddUpdateAppSettings("NewSetting", "May 7, 2014");            AddUpdateAppSettings("Setting1", "May 8, 2014");            ReadAllSettings();        }        static void ReadAllSettings()        {            try            {                var appSettings = ConfigurationManager.AppSettings;                if (appSettings.Count == 0)                {                    Console.WriteLine("AppSettings is empty.");                }                else                {                    foreach (var key in appSettings.AllKeys)                    {                        Console.WriteLine("Key: {0} Value: {1}", key, appSettings[key]);                    }                }            }            catch (ConfigurationErrorsException)            {                Console.WriteLine("Error reading app settings");            }        }        static void ReadSetting(string key)        {            try            {                var appSettings = ConfigurationManager.AppSettings;                string result = appSettings[key] ?? "Not Found";                Console.WriteLine(result);            }            catch (ConfigurationErrorsException)            {                Console.WriteLine("Error reading app settings");            }        }        static void AddUpdateAppSettings(string key, string value)        {            try            {                var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);                var settings = configFile.AppSettings.Settings;                if (settings[key] == null)                {                    settings.Add(key, value);                }                else                {                    settings[key].Value = value;                }                configFile.Save(ConfigurationSaveMode.Modified);                ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);            }            catch (ConfigurationErrorsException)            {                Console.WriteLine("Error writing app settings");            }        }    }}

前面的樣本假定您的項目有一個 App.config 檔案如下所示。

XML 

<?xml version="1.0" encoding="utf-8" ?><configuration>    <startup>         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />    </startup>  <appSettings>    <add key="Setting1" value="May 5, 2014"/>    <add key="Setting2" value="May 6, 2014"/>  </appSettings></configuration>

ConfigurationManager 讀寫AppSettings索引值對